骨关节炎的病因是()
A.遗传因素
B.性激素
C.机械因素
D.肥胖
E.以上均是
参考答案:E
解析:
遗传因素,性激素,机械因素,肥胖都是骨性关节炎的病因。
Millions of pounds’ worth of damage _____ by a storm which swept across the north of England.
A.has been caused
B.had been caused
C.will be caused
D.will have been caused
中国证券业协会可对证券经营机构担任某只证券的承销商提出否决意见;对自收到完整的备案材料的30个工作日内中国证券业协会未提出否决意见的,视为得到认可。( )